The KSZ8081RNACA is a product from Microchip Technology, specifically a 10/100 Ethernet PHY (Physical Layer) transceiver . This device provides the interface between a digital system (such as a microcontroller or processor) and the physical Ethernet network, allowing communication over Ethernet at 10 or 100 Mbps speeds.
Package and Pinout
The KSZ8081RNACA typically comes in a QFN (Quad Flat No-lead) package, which is a surface-mount package with leads underneath, making it ideal for high-density applications.
The number of pins can vary based on the exact model, but it generally comes in either a 32-pin or 48-pin package, and each pin serves a specific purpose related to its function in the Ethernet interface.
Pin Function List and Explanation
Below is an overview of the pin function specifications for the KSZ8081RNACA. I will provide a detai LED description of the pin functions for each pin available in the package, and then I'll give you the FAQ for this chip.
Pin Function List (32-pin package)
Pin Number Pin Name Pin Type Description 1 VDDIO Power Power supply for the I/O pins. 2 GND Ground Ground connection for the chip. 3 REFCLK Input Reference Clock input for the PHY. 4 TXD0 Output Transmit data, bit 0 (TX Data). 5 TXD1 Output Transmit data, bit 1 (TX Data). 6 TXD2 Output Transmit data, bit 2 (TX Data). 7 TXD3 Output Transmit data, bit 3 (TX Data). 8 TX_EN Output Transmit enable signal (TX Enable). 9 TX_CLK Output Transmit clock signal. 10 RXD0 Input Receive data, bit 0 (RX Data). 11 RXD1 Input Receive data, bit 1 (RX Data). 12 RXD2 Input Receive data, bit 2 (RX Data). 13 RXD3 Input Receive data, bit 3 (RX Data). 14 RX_ER Input Receive error signal. 15 RX_DV Input Receive data valid signal. 16 RX_CLK Input Receive clock signal. 17 CRS_DV Input Carrier sense and data valid (indicates if Ethernet is active). 18 COL Input Collision detection signal (used in 10Base-T). 19 MDIO Input/Output Management Data Input/Output (for communication with the MAC). 20 MDC Input Management Data Clock (for communication with the MAC). 21 LED1 Output LED control for Link status. 22 LED2 Output LED control for Activity status. 23 LED3 Output LED control for Speed indicator. 24 RST Input Reset pin. 25 SMI_MDC Input SMI Management Clock (used for PHY control). 26 SMI_MDIO Input/Output SMI Management Data (used for PHY control). 27 VDDIO Power Power supply for the I/O pins. 28 GND Ground Ground connection for the chip. 29 VDD_PHY Power Power supply for the PHY core. 30 GND_PHY Ground Ground for PHY core. 31 LINK100 Output 100 Mbps Link status signal. 32 LINK10 Output 10 Mbps Link status signal.FAQ - Frequently Asked Questions (KSZ8081RNACA)
Q1: What is the main function of the KSZ8081RNACA?
A1: The KSZ8081RNACA is a 10/100 Ethernet PHY transceiver, designed to interface a digital system (such as a microcontroller) to an Ethernet network, supporting 10/100 Mbps speeds.
Q2: What is the operating voltage range of the KSZ8081RNACA?
A2: The KSZ8081RNACA typically operates with a supply voltage range of 2.375V to 3.6V for I/O, and 3.3V for the PHY core.
Q3: How many pins does the KSZ8081RNACA have?
A3: The KSZ8081RNACA has a 32-pin package. It is also available in other package options with different pin configurations.
Q4: What is the function of the TXD0–TXD3 pins?
A4: These pins are the transmit data lines. The TXD0–TXD3 pins are used to transmit data from the system to the Ethernet network, with each pin carrying one bit of data.
Q5: What is the purpose of the MDIO and MDC pins?
A5: The MDIO (Management Data Input/Output) and MDC (Management Data Clock) pins are used for communication between the PHY and the Media Access Controller (MAC) for configuration and control purposes, following the IEEE 802.3 management interface protocol.
Q6: What is the function of the CRS_DV pin?
A6: The CRS_DV pin indicates carrier sense and data valid signals. It alerts the system that the PHY has detected an Ethernet carrier and that data is valid for transmission or reception.
Q7: How do the LED1–LED3 pins work?
A7: These pins control LEDs that indicate different status conditions of the PHY. LED1 indicates the link status, LED2 indicates activity, and LED3 indicates the operating speed (10 Mbps or 100 Mbps).
Q8: Can the KSZ8081RNACA support both 10Base-T and 100Base-TX Ethernet standards?
A8: Yes, the KSZ8081RNACA supports both 10Base-T (10 Mbps) and 100Base-TX (100 Mbps) Ethernet standards.
Q9: What does the RST pin do?
A9: The RST pin is used to reset the KSZ8081RNACA. When the reset signal is applied, it initializes the PHY to its default state.
Q10: How does the collision detection (COL) pin work?
A10: The COL pin detects collisions on the Ethernet network in 10Base-T operation. If a collision occurs, it will be asserted, signaling that data transmission should be retransmitted.
This is a general overview of the KSZ8081RNACA pinout and its functions. Since the chip could come in different variants, make sure to consult the specific datasheet for your model to confirm the exact pin configuration and other specifications.
If you need more specific details, feel free to ask!
